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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2017-06-01 18:07:55 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-14 15:05:52 +0200
commit0255284edddcfbba86c8997da2836a9bafc0354a (patch)
tree1adab6c02b439f728495e54851a84c627fb23220 /net
parent3dd4daf112fd0c29e35b5f08af25ad93920e61aa (diff)
net: bridge: start hello timer only if device is up
[ Upstream commit aeb073241fe7a2b932e04e20c60e47718332877f ] When the transition of NO_STP -> KERNEL_STP was fixed by always calling mod_timer in br_stp_start, it introduced a new regression which causes the timer to be armed even when the bridge is down, and since we stop the timers in its ndo_stop() function, they never get disabled if the device is destroyed before it's upped. To reproduce: $ while :; do ip l add br0 type bridge hello_time 100; brctl stp br0 on; ip l del br0; done; CC: Xin Long <lucien.xin@gmail.com> CC: Ivan Vecera <cera@cera.cz> CC: Sebastian Ott <sebott@linux.vnet.ibm.com> Reported-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Fixes: 6d18c732b95c ("bridge: start hello_timer when enabling KERNEL_STP in br_stp_start") Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_stp_if.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index 5a782f543aff..16b5aa9a91f1 100644
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -185,7 +185,8 @@ static void br_stp_start(struct net_bridge *br)
br_debug(br, "using kernel STP\n");
/* To start timers on any ports left in blocking */
- mod_timer(&br->hello_timer, jiffies + br->hello_time);
+ if (br->dev->flags & IFF_UP)
+ mod_timer(&br->hello_timer, jiffies + br->hello_time);
br_port_state_selection(br);
}